Hello, Kayra.
Error 0xc0000005 means that the application is blocked due to the fact that it is trying to access protected areas of the OS kernel itself. Similar problems happen quite often with Roblox (crooked game code). Try adding the folder with the game to the antivirus program exceptions, and I also recommend contacting Roblox support and reporting the situation by filling out the form on the page https://www.roblox.com/support